path: root/kernel/compat.c
diff options
authorChris Metcalf <>2011-05-09 13:12:30 -0400
committerChris Metcalf <>2011-05-12 15:51:36 -0400
commitbe84cb43833ee40a42e08f5425d20310f16229c7 (patch)
tree0d5ddbaac88aa99ab5dbd0925ec525d399405fd5 /kernel/compat.c
parentd2e48c1d4184a0baa4bf09920b63661e0b860b8c (diff)
compat: fixes to allow working with tile arch
The existing <asm-generic/unistd.h> mechanism doesn't really provide enough to create the 64-bit "compat" ABI properly in a generic way, since the compat ABI is a mix of things were you can re-use the 64-bit versions of syscalls and things where you need a compat wrapper. To provide this in the most direct way possible, I added two new macros to go along with the existing __SYSCALL and __SC_3264 macros: __SC_COMP and SC_COMP_3264. These macros take an additional argument, typically a "compat_sys_xxx" function, which is passed to __SYSCALL if you define __SYSCALL_COMPAT when including the header, resulting in a pointer to the compat function being placed in the generated syscall table. The change also adds some missing definitions to <linux/compat.h> so that it actually has declarations for all the compat syscalls, since the "[nr] = ##call" approach requires proper C declarations for all the functions included in the syscall table. Finally, compat.c defines compat_sys_sigpending() and compat_sys_sigprocmask() even if the underlying architecture doesn't request it, which tries to pull in undefined compat_old_sigset_t defines. We need to guard those compat syscall definitions with appropriate __ARCH_WANT_SYS_xxx ifdefs. Acked-by: Arnd Bergmann <> Signed-off-by: Chris Metcalf <>
Diffstat (limited to 'kernel/compat.c')
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 38b1d2c1cbe8..80c28562f57b 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -293,6 +293,8 @@ asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
return compat_jiffies_to_clock_t(jiffies);
* Assumption: old_sigset_t and compat_old_sigset_t are both
* types that can be passed to put_user()/get_user().
@@ -312,6 +314,10 @@ asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
return ret;
asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
compat_old_sigset_t __user *oset)
@@ -333,6 +339,8 @@ asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
return ret;
asmlinkage long compat_sys_setrlimit(unsigned int resource,
struct compat_rlimit __user *rlim)